The writer once again teaches first century Christians (and us) that the law could not make them perfect; could not bring them a complete atonement and forgiveness of sins. "The law could not make the comers thereunto perfect." And then, in (V5-10), the writer shows us a divine conversation that happened between God the Father and God the Son. God, says the Son, was never satisfied with sacrifices and offerings. And he shows us that Christ was not just a sinless human sacrifice, but in Jesus' life and in His death, He delighted to do the Father's will. The writer was teaching Hebrews Christians that there was so much more to Christ than just an earthly and fleshly body to be offered up in sacrifice. He delighted to do His Father's will! There had never been, nor ever shall there be a Man to walk upon this earth whom God delighted in like the Lord Jesus Christ!